HT1277 Sender address rejected by server

I keep getting an error message when trying to send mail. It states: sender address was rejected by server. I have called my email provider and everything is setup properly according to their requirements. Why is this happening? I also have a .me account setup in macmail and am able to send from there no problem.

I am having the same issue and I didn't change any settings. it has been working fine for two months and all of a sudden today the server is reajecting all of my emails. This doesn't make sense. I have even reentered all of the server outgoing and incoming information and nothing. help?

I am having the same problem on my MAC OS X Lion 10.7.5 . The problem started in January. I receive the message when sending email "Cannot send message using server x.xxx@q.com. Sender address x.xxx@q.com was rejected". The first time this happed my service provider was able to fix the problem. The message reared it's ugly head again on this past Tuesday. I worked with Apple support for over two hours, my service provider, Century Link for two days. Mail is configured correctly, Apple scanned my hard drive to see if the problem was with my MAC. I still am unable to send email via MAC Mail. I have to go to my service provider's site, Century Link to send mail. When speaking with a tech support at Century Link, he stated that they did not support Apple Lion. Any suggestions? I am almost considering going back to Leapard application to see if that will work.

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